CN110504704A - A kind of bipolar MMC change of current station control system and its control method grid-connected for offshore wind farm - Google Patents
A kind of bipolar MMC change of current station control system and its control method grid-connected for offshore wind farm Download PDFInfo
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Abstract
The present invention provides a kind of bipolar MMC change of current station control system grid-connected for offshore wind farm and its control method, the bipolar MMC converter station in sea being connected including the land bipolar MMC converter station being connected with land AC system and with marine wind electric field, land bipolar MMC converter station are connected with marine bipolar MMC converter station；Land bipolar MMC converter station includes positive and negative electrode MMC inverter, is connected respectively with land AC system, is all made of and determines DC voltage and determine Reactive Power Control；Marine bipolar MMC converter station includes positive and negative electrode MMC inverter, is connected respectively with marine wind electric field, using the master-slave control strategy with power equalization ability.Advantages of the present invention are as follows: stable synchronous AC power supply can be provided for marine wind electric field and avoid interacting between positive and negative the two poles of the earth MMC inverter.
Description
Technical field
The present invention relates to electric system transmission & distribution electro-technical fields, and in particular to a kind of for grid-connected bipolar of offshore wind farm
MMC change of current station control system and its control method.
Background technique
It in recent years, is the consumption and the prevention and treatment ecological environmental pollution that reduce fossil resource, China supports to develop new energy energetically
Power generating industry, such as photovoltaic power generation, wind-power electricity generation.Currently, specific gravity of the wind-power electricity generation in China's total installed capacity of electricity has been more than
7%, become the third-largest power source for being only second to thermoelectricity, water power.Wherein, offshore wind energy resource is high-quality, abundant, and far from residence
People's livelihood work operation area, has fewer environmental impacts, thus is even more the concern by numerous developers.To in April, 2017, China sea
Upper 8,170,000 kilowatts of wind-powered electricity generation approval of account capacity, 1,480,000 kilowatts of grid connection capacity, global third position is ranked, Britain and moral are only second to
State.Offshore wind farm policy is clear, the increasingly maturation of the Continuous optimization of construction cost and mating industry.
The grid-connected mode of marine wind electric field, which can be divided mainly into, exchanges the grid-connected and grid-connected two types of direct current, when offshore distance
When remote and wind power plant capacity is larger, wind power plant is grid-connected more particularly suitable using high voltage direct current.Wherein, based on voltage source converter
Flexible DC transmission (voltage source converter based high voltage direct current, VSC-
HVDC) technology has control flexibly, does not need power grid and provides commutation voltage, synchronous AC power supply can be provided for Wind turbines
The advantages such as support are a kind of technology of transmission of electricitys for being extremely suitble to offshore wind farm grid-connected.Offshore platform can be saved using soft straight technology
Space, weakens wind electricity volatility, and the remote high-capacity wind power plant to have put into operation at present has been all made of flexible DC transmission technology
As connect-in strategy.Wherein modularization multi-level converter MMC is less by its harmonic component, does not need using power device
The advantages such as serial connection technology become voltage source converter preferred in the grid-connected engineering of offshore wind farm.
In engineering of the existing foreign countries' offshore wind farm using flexible direct current submitting, use is symmetrical monopolar structure
Two-terminal direct current transmission system, only one MMC inverter of the system access wind field side of the structure, using constant voltage frequency and
The control model of amplitude provides the support of alternating-current voltage source for wind field.With being gradually increased for the following offshore wind farm scale, and
The power conveyed required for net system also will rapid growth, the MMC transmission system of symmetrical monopolar structure is just no longer able at this time
Meet the needs of power submitting, needs to carry out the submitting of offshore wind farm using the MMC of true dipolar configuration.However use is very double
When the structure of pole, if the inverter of positive and negative anodes is all made of the control model of constant voltage frequency and voltage magnitude, it will cause two to change
Stream device output voltage interacts, and causes to vibrate, not good for system stability.
Therefore, it is necessary in addition study the control strategy for the very bipolar MMC converter station sent out for offshore wind farm, to realize
The stable operation of the offshore wind farm system of future very bipolar soft straight system grid connection.
Summary of the invention
The object of the present invention is to provide one kind for offshore wind farm to be grid-connected, can guarantee in operational process to offshore wind farm
The bipolar MMC change of current station control system and its controlling party that field provides stable alternating-current voltage source, positive and negative anodes is made to keep power-balance
Method.
In order to achieve the above object, the present invention is achieved through the following technical solutions:
A kind of bipolar MMC change of current station control system grid-connected for offshore wind farm, including what is be connected with land AC system
Land bipolar MMC converter station and the bipolar MMC converter station in sea being connected with marine wind electric field, land bipolar MMC converter station and sea
Upper bipolar MMC converter station is connected；Land bipolar MMC converter station includes positive and negative electrode MMC inverter, respectively with land AC system
It is connected, is all made of and determines DC voltage and determine Reactive Power Control；Marine bipolar MMC converter station includes positive and negative electrode MMC inverter,
It is connected respectively with marine wind electric field, using the master-slave control strategy with power equalization ability；
The master-slave control strategy is to select a pole MMC from the positive and negative electrode MMC inverter of marine bipolar MMC converter station
Inverter is used as main MMC inverter, another pole from MMC inverter；Main MMC inverter is using exchange side electric voltage frequency surely
With the control mode of constant voltage amplitude, assist main MMC inverter marine to land bipolar MMC converter station conveying from MMC inverter
The power of wind power plant sending simultaneously keeps master and slave MMC inverter transmission power to balance.
A kind of bipolar MMC converter station control method grid-connected for offshore wind farm, includes the following steps:
S1 land bipolar MMC converter station and marine bipolar MMC converter station) are built, respectively with land AC system and sea
Wind power plant is connected, and land bipolar MMC converter station is connected with marine bipolar MMC converter station；
S2) the positive and negative electrode MMC inverter of land bipolar MMC converter station, which is all made of, determines DC voltage and determines reactive power control
System；
S3) for the positive and negative electrode MMC inverter of marine bipolar MMC converter station, a pole MMC inverter is selected to change as master
Device is flowed, another pole inverter is used as from inverter, and main MMC inverter using exchanging side electric voltage frequency and constant voltage amplitude surely
Control model；Power is positive when setting MMC inverter absorbs power from ac bus, measures main MMC inverter from ac bus
The active-power P 1 and reactive power Q 1 of absorption, the active-power P 2 absorbed from MMC inverter from ac bus and reactive power
Q2；
S4 the per unit value of the amount of unbalance of the active power and reactive power between master and slave MMC inverter) is calculated separately:
S5 it) is controlled the amount of unbalance of the above-mentioned active power being calculated and reactive power as proportional, integral
The result that proportional-plus-integral controller exports is added active power initial set value P0 and idle function by the input signal of device respectively
Rate initial set value Q0 obtains the active power command value Pref and reactive power command value Qref from MMC inverter；Wherein,
Integration time constant in proportional, integral link takes 0.2, and proportionality coefficient takes 0.01, the maximum output of proportional, integral link and
Minimum output is limited in 1 and -1 respectively；
S6 the grid-connected bipolar MMC converter station of offshore wind farm) will be used to put into operation；
In a stable operation state, from MMC inverter according to S5) instruction value that is calculated is by determining active power and fixed
Reactive power operation；
When main MMC inverter breaks down out of service or locking, Xiang Cong MMC inverter issues signal, changes from MMC
Stream device is connected to after signal to be converted to by determining active power with the control model for determining reactive power and fixed exchange side electric voltage frequency and determine electricity
The control model of pressure amplitude value substitutes main MMC inverter as marine wind electric field and provides AC power source support.
Compared with prior art, the present invention having the advantage that
The present invention a kind of bipolar MMC change of current station control system and its control method grid-connected for offshore wind farm, are very double
The grid-connected soft straight transmission system of the offshore wind farm of pole structure provides a kind of feasible control strategy, can mention for marine wind electric field
For stable synchronous AC power supply and avoid interacting between positive and negative the two poles of the earth MMC inverter.
In steady state operation, the present invention can make the positive and negative electrode inverter of marine bipolar MMC converter station with exchange
The exchange power of system is equal, guarantees the power-balance between positive and negative electrode inverter.
When main MMC inverter breaks down, the present invention can guarantee to continue stable operation from MMC inverter, improve
The reliability of wind-powered electricity generation transmitting system.
Detailed description of the invention
Fig. 1 is a kind of topological structure signal of bipolar MMC change of current station control system grid-connected for offshore wind farm of the present invention
Figure.
Fig. 2 is to calculate active power in a kind of bipolar MMC converter station control method grid-connected for offshore wind farm of the present invention
The functional block diagram of instruction value and reactive power command value.
Fig. 3 is steady state operation in a kind of bipolar MMC converter station control method grid-connected for offshore wind farm of the present invention
The power waveform figure that middle sea converter station is exchanged with marine wind electric field.
Fig. 4 is that fault condition is plunged into the commercial sea in a kind of bipolar MMC converter station control method grid-connected for offshore wind farm of the present invention
The power waveform figure that upper converter station is exchanged with marine wind electric field.
Specific embodiment
With reference to the accompanying drawing, the embodiment of the present invention is described in further detail.
As shown in Figure 1, a kind of bipolar MMC change of current station control system grid-connected for offshore wind farm, including exchanged with land
The connected land bipolar MMC converter station of system and the bipolar MMC converter station in sea being connected with marine wind electric field, land bipolar MMC
Converter station is connected with marine bipolar MMC converter station；Each bipolar MMC converter station is all made of the very bipolar mode of connection, and every level-one is all
It is connected by a MMC inverter with AC system, the rated power of each MMC inverter is S.The land bipolar MMC change of current
It stands including positive and negative electrode MMC inverter, is connected respectively with land AC system, be all made of and determine DC voltage and determine reactive power
Control；Marine bipolar MMC converter station includes positive and negative electrode MMC inverter, is connected respectively with marine wind electric field, using with power
The master-slave control strategy of the ability of equalization；
The master-slave control strategy is to select a pole MMC from the positive and negative electrode MMC inverter of marine bipolar MMC converter station
For inverter as main MMC inverter, generally selecting positive MMC inverter is main MMC inverter, and another pole is used as from the MMC change of current
Device；Main MMC inverter is using the control mode for exchanging side electric voltage frequency and constant voltage amplitude surely, the main control of main MMC inverter
Target processed is that stable synchronous AC power supply is provided for marine wind electric field, assists main MMC inverter to land from MMC inverter
The power of bipolar MMC converter station conveying marine wind electric field sending simultaneously keeps master and slave MMC inverter transmission power to balance.
A kind of bipolar MMC converter station control method grid-connected for offshore wind farm, includes the following steps:
S1 land bipolar MMC converter station and marine bipolar MMC converter station) are built, respectively with land AC system and sea
Wind power plant is connected, and land bipolar MMC converter station is connected with marine bipolar MMC converter station；
S2) the positive and negative electrode MMC inverter of land bipolar MMC converter station, which is all made of, determines DC voltage and determines reactive power control
System；
S3) for the positive and negative electrode MMC inverter of marine bipolar MMC converter station, a pole MMC inverter is selected to change as master
Device is flowed, another pole inverter is used as from inverter, and main MMC inverter using exchanging side electric voltage frequency and constant voltage amplitude surely
Control model；Power is positive when setting MMC inverter absorbs power from ac bus, measures main MMC inverter from ac bus
The active-power P 1 and reactive power Q 1 of absorption, the active-power P 2 absorbed from MMC inverter from ac bus and reactive power
Q2；
S4 the per unit value of the amount of unbalance of the active power and reactive power between master and slave MMC inverter) is calculated separately:
S5) as shown in Fig. 2, using the amount of unbalance of the above-mentioned active power being calculated and reactive power as than
The result that proportional-plus-integral controller exports is added active power respectively and initially set by the input signal of example-integral controller
Value P0 and reactive power initial set value Q0 obtains instructing from the active power command value Pref and reactive power of MMC inverter
Value Qref；Wherein, the integration time constant in proportional, integral link takes 0.2, and proportionality coefficient takes 0.01, proportional, integral link
Maximum output and minimum output be limited in 1 and -1 respectively；
S6 the grid-connected bipolar MMC converter station of offshore wind farm) will be used to put into operation；
In a stable operation state, from MMC inverter according to S5) instruction value that is calculated is by determining active power and fixed
Reactive power operation；
When main MMC inverter breaks down out of service or locking, Xiang Cong MMC inverter issues signal, changes from MMC
Stream device is connected to after signal to be converted to by determining active power with the control model for determining reactive power and fixed exchange side electric voltage frequency and determine electricity
The control model of pressure amplitude value substitutes main MMC inverter as marine wind electric field and provides AC power source support.
In specific embodiment, use rated direct voltage for positive and negative 320kv, specified transmission power is 1000MW, land to change
Stream station is connected with land AC system, and marine converter station is connected with the marine wind electric field that a gross rated capacity is 1000MVA.
Each pole is connected by the MMC inverter that a voltage rating is 320kv with AC system, the design parameter of inverter such as table 1
It is shown.
Table 1
In a stable operation state, it is pressed from MMC inverter according to above-metioned instruction value and determines active power and determine reactive power to transport
Row.It now sets marine wind electric field and issues power in preceding 3.5s as 150MW, become 200MW in 3.5s, obtain as shown in Figure 3
The power waveform figure that marine converter station is exchanged with marine wind electric field in steady state operation.
When main MMC inverter breaks down out of service or locking, the positive MMC of the marine bipolar converter station of setting is changed
Device is flowed in 3s because failure is out of service, while cathode MMC inverter receives instruction and is changed into fixed exchange side electric voltage frequency and determines
The control model of voltage magnitude obtains the power that marine converter station is exchanged with marine wind electric field under fault condition as shown in Figure 4
Waveform diagram.
As shown in Figure 3,4, in steady state operation, the present invention can make the marine bipolar converter station positive and negative anodes MMC change of current
Device is equal with the power that AC system exchanges, and guarantees the power-balance between positive and negative anodes；Meanwhile it being sent out in a pole of transmission system
In the case where raw failure, the present invention can guarantee that transmission power is continued in another pole.
The above is only the preferred embodiment for the present invention, it is noted that for the ordinary skill people of the art
Member, without departing from the inventive concept of the premise, can also make several improvements and modifications, these improvements and modifications should also regard
For in the scope of the present invention.
Claims (2)
1. a kind of bipolar MMC change of current station control system grid-connected for offshore wind farm, it is characterised in that: including exchanging system with land
The connected land bipolar MMC converter station of system and the bipolar MMC converter station in sea being connected with marine wind electric field, land bipolar MMC are changed
Stream station is connected with marine bipolar MMC converter station；Land bipolar MMC converter station includes positive and negative electrode MMC inverter, respectively with it is land
AC system is connected, and is all made of and determines DC voltage and determine Reactive Power Control；Marine bipolar MMC converter station includes positive and negative electrode MMC
Inverter is connected with marine wind electric field respectively, using the master-slave control strategy with power equalization ability；
The master-slave control strategy is to select a pole MMC change of current from the positive and negative electrode MMC inverter of marine bipolar MMC converter station
Device is used as main MMC inverter, another pole from MMC inverter；Main MMC inverter is using exchange side electric voltage frequency surely and determines electricity
The control mode of pressure amplitude value assists main MMC inverter to convey marine wind electric field to land bipolar MMC converter station from MMC inverter
The power of sending simultaneously keeps master and slave MMC inverter transmission power to balance.
2. a kind of bipolar MMC converter station control method grid-connected for offshore wind farm, it is characterised in that include the following steps:
S1 land bipolar MMC converter station and marine bipolar MMC converter station) are built, respectively with land AC system and offshore wind farm
Field is connected, and land bipolar MMC converter station is connected with marine bipolar MMC converter station；
S2) the positive and negative electrode MMC inverter of land bipolar MMC converter station, which is all made of, determines DC voltage and determines Reactive Power Control；
S3) for the positive and negative electrode MMC inverter of marine bipolar MMC converter station, select a pole MMC inverter as main inverter,
Another pole inverter is used as from inverter, and main MMC inverter is using the control mould for exchanging side electric voltage frequency and constant voltage amplitude surely
Formula；Power is positive when setting MMC inverter absorbs power from ac bus, measures what main MMC inverter was absorbed from ac bus
Active-power P 1 and reactive power Q 1, the active-power P 2 and reactive power Q 2 absorbed from MMC inverter from ac bus；
S4 the per unit value of the amount of unbalance of the active power and reactive power between master and slave MMC inverter) is calculated separately:
S5) using the amount of unbalance of the above-mentioned active power being calculated and reactive power as proportional-plus-integral controller
Input signal, at the beginning of the result that proportional-plus-integral controller exports is added active power initial set value P0 and reactive power respectively
Beginning setting value Q0 obtains the active power command value Pref and reactive power command value Qref from MMC inverter；Wherein, ratio-
Integration time constant in integral element takes 0.2, and proportionality coefficient takes 0.01, and the maximum output and minimum of proportional, integral link are defeated
It is limited in 1 and -1 respectively out；
S6 the grid-connected bipolar MMC converter station of offshore wind farm) will be used to put into operation；
In a stable operation state, from MMC inverter according to S5) instruction value that is calculated is by determining active power and fixed idle function
Rate operation；
When main MMC inverter breaks down out of service or locking, Xiang Cong MMC inverter issues signal, connects from MMC inverter
It is converted to after to signal by determining active power with the control model for determining reactive power and fixed exchanges side electric voltage frequency and constant voltage amplitude
Control model, substitute main MMC inverter for marine wind electric field provide AC power source support.
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| CN111049399A (en) * | 2019-12-31 | 2020-04-21 | 中国电建集团华东勘测设计研究院有限公司 | Power balance controller, virtual impedance-based bipolar MMC converter station passive control strategy and flexible direct current transmission system |
| CN111711183A (en) * | 2020-07-13 | 2020-09-25 | 集美大学 | Multi-terminal direct-current power grid power flow control circuit and control method thereof |
| CN113452061A (en) * | 2021-07-05 | 2021-09-28 | 南方电网科学研究院有限责任公司 | Offshore wind power direct current transmission system and control method thereof |
| CN114665521A (en) * | 2022-04-19 | 2022-06-24 | 南方电网科学研究院有限责任公司 | Multi-offshore wind power plant coordination control system |
| CN116667421A (en) * | 2023-07-28 | 2023-08-29 | 中国华能集团清洁能源技术研究院有限公司 | Offshore wind power control system and method and electronic equipment |
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| CN111049399B (en) * | 2019-12-31 | 2021-03-30 | 中国电建集团华东勘测设计研究院有限公司 | Power balance controller, virtual impedance-based bipolar MMC converter station passive control strategy and flexible direct current transmission system |
| CN111711183A (en) * | 2020-07-13 | 2020-09-25 | 集美大学 | Multi-terminal direct-current power grid power flow control circuit and control method thereof |
| CN113452061A (en) * | 2021-07-05 | 2021-09-28 | 南方电网科学研究院有限责任公司 | Offshore wind power direct current transmission system and control method thereof |
| CN114665521A (en) * | 2022-04-19 | 2022-06-24 | 南方电网科学研究院有限责任公司 | Multi-offshore wind power plant coordination control system |
| CN114665521B (en) * | 2022-04-19 | 2023-03-10 | 南方电网科学研究院有限责任公司 | Multi-offshore wind power plant coordination control system |
| CN116667421A (en) * | 2023-07-28 | 2023-08-29 | 中国华能集团清洁能源技术研究院有限公司 | Offshore wind power control system and method and electronic equipment |
| CN116667421B (en) * | 2023-07-28 | 2023-10-20 | 中国华能集团清洁能源技术研究院有限公司 | Offshore wind power control system and method and electronic equipment |
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